If you think of the cycle as a continuous row of dominoes all nicely lined up, one "fall" causing a next reaction....
what's the only way to stop that cycle of continuous cause and effect? Take away 1 domino. The rest stay standing.
The only way to break the cycle is to stop doing what you're doing, and not start it again. It's not what H is doing. You can't control him. You need to find some trigger, recognize it, and not do it.
Does that mean H won't try something different to start a whole new cycle to get what he wants? (Like shaking the table to make all the dominoes fall) Of course not. In fact, that's probably the expected outcome, but then you recognize that and change your reaction.
Getting a journal and writing things down helps a lot!!
Write what H did, write your steps/reaction and then write H's reaction. Then it's easier to back track and chart what works and what didn't. It's amazing what seeing the "cycle" in writing does for clarity.